Just finished building the car, everything seems to be very good except the spur and pinion setup. I fitted a Kimbrough spur which clears fine but I realized while fitting the motor that it's going to be a bitch to tighten one of the motor screws but that's not that big of a deal. The main problem is that I am using the Epic Trinity pinions and they rub on the top deck (both sides), should I start using PRS or any other narrow pinions or just sand the inside of the top deck so the Epic pinions fit?